I want to run a double triangualted 4 link up front. The engine is in the rear and there is very little limiting link placment in the front. If I use a rack and pinion mounted on the axle from PSC that will control any bump steer correct? I don't see how it would not. But, maybe I missed somethimg I could catch now avoiiding a costly mistake.

i'm curious, but how were you going to run the steering link from the wheel to the rack and pinion and still let it cycle with the suspension? Normally isn't the rack and pinion fixed to the frame? I don't quite follow this.

I don't think you need a crappy picture. Think of a rack and pinion mounted in the same manner as a double hydro ram. Now think of a slip shaft drive shaft going from the rack to the firewall. There is a smaller shaft parallel to the floor behind the firewall connecting to the steering wheel. As the suspension cycles the steering shaft extends and contracts. Because the rack and pinion is hydraulic it should resist bump steer. This should give me as much flexibility as with a full hydro running a 4 link while still providing a manual interaction in the event of a loss of hydraulic pressure. I would think at extreme droop of over 15" the steering shaft may move slightly as the u joints align. But, for daily driving with a travel of 10"(max) I do not see it causing any issues. Although feedback is helpful and perhaps I am missing something.

If I can not do it I will need to run a standard cross over steering system with assist. I will also need to run a 3 link with a pan-hard bar because using a triangulated 4 link or 3 link with a watts linkage will bump steer like crazy.

I am not doubting you at all. I simply just want to know why it is a brain dead idea?

There is a buggy in the latest issue of crawl right with the rack and pinion set up you are talking about. I believe the price of the correct rack that can withstand the abuse an offload rig can put out will prevent you from doing it though. It will in no way be cheap. Why not just run a three link front with a track bar and conventional steering maybe with a hydro assist? Or is that too simple and proven?

Imagine one side of the axle stays still while the other droops, the axle will effectively move towards the side, at best it will pivot at a point somewhere near the link point on the side that stays stationary. With the steering wheel stationary, that will mean the the steering shaft going into the rack will turn, steering the tires. There's the bump steer you think your avoiding. If it doesn't steer, it will turn the wheel in your hands. Better keep your fingers clear.
Then there's how much strength you would need in the rack itself (good luck finding one that will hold up to a heavy tire/wheel combo, not to mention being slammed sideways in an off road situation), and the amount of slip you would need in the steering shaft, plus the rag joints or u-joints in that shaft will take alot of abuse.
I don't see any way this could be done and made more functional then a basic crossover, or full hydraulic.

Thanks for talking some sense into me. I knew about the cost to do this right and was ok with it considering what I wanted in the lines of travel. But, a 3 link leaves considerable less room for error, gives me a lot more freedom in mounting the bags, and is more reliable. A 3 link is ultimately more stout and that is overall what is most important in this build. I will just set the panhard for the 8" street height, when the clearance drops to 4" at higher speeds or raises to 15" for trail use the panhard will pull the axle.
With somewhere around 200" of hydraulic hose I really don't feel comfortable with full hydro at highway speeds. So the 3 link with assist is the best option.